CCNA - OSI Model - 1.txt
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Name the two sublayers of the IEEE Data Link Layer?
Logical Link Control and Media Access Control
Bridges work at which layer of the OSI reference model?
- Layer 2 - Data Link
- Bridges use MAC or hardware addresses for filtering
Repeaters work at which layer of the OSI reference model?
- Layer 1 � Physical Layer
- They regenerate the physical signal
Name the layer and list some characteristics of the Application Layer?
- Layer 7 � file, print, message, application, database services
Name the layer and list some characteristics of the Presentation Layer?
Layer 6 � encryption/decryption, compression, expansion
List some presentation layer standards?
- MPEG, MIDI & QuickTime for movies and sound
- PICT, TIFF & JPEG for direct graphic and visual images
- ASCII & EBCDIC for data standards
Name the layer and list some characteristics of the Session Layer?
Layer 5 � dialog control
Name the layer and list some characteristics of the Transport Layer?
Layer 4 � end-to-end connection
List 3 statements about connection oriented sessions?
- Segments delivered are acknowledged back to the sender upon reception
- Segments are sequenced back into their proper order upon arrival at destination
- Manageable data flow is maintained in order to avoid congestion, overloading, & loss of data.
CPE is an acronym for?
Customer Premise Equipment
CO is an acronym for?
Central Office (telephone implied)
State 3 reasons why the networking industry might use a layered approach?
- Allows change in one layer to occur without changing another layer
- Clarifies what general function is to be done rather than how to do it.
- Facilitates systematic troubleshooting
Name the OSI layer that defines bit synchronization?
Layer 1 - Physical
Name the OSI layer that defines physical topology?
Layer 1 � Physical
Name the OSI layer responsible for putting 1s and 0s in a logical group?
Layer 2 � Data Link
Name the OSI layer responsibile for framing?
Layer 2 � Data Link
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